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Try this solution : https://community.zyxel.com/en/discussion/11497/xmg3927-b50a-firmware-version

Hey Joel, I update my firmware come from Swisscom (Switzerland) to the factory one this weekend because I needed to use mPro Mesh solutions from Zyxel. Base firmware branded : V5.13(ABQO.0)D0.Updated firmware : V5.17(ABMT.5)C0. Please watch this video to help you : https://youtu.be/vHDUjFk9u1M STEP 1 : Use Terminal (MacOs)…